final drive ratios explained

The final drive ratio is typically the gear ratio for the differential or the final location where the gearing is altered before being sent to the wheels. Select a mph speed multiply that by the overall gear ratio which is the gear ratio of the rear drive and the transmission gear ratio multiply them.

Differential Gear Ratio Also Known As Final Gear

For every one turn of the output shaft leading to a tire the final drive ratio represents how many times the pinion gear on the motor shaft must turn.

. You divide the engine RPM by the output gear ratio to find driveshaft RPMso on a 73 double overdrive final trans ratio at 1500 engine RPM the driveshaft speed is 2054 RPM. What is a Rear End Gear Ratio. What is a final drive ratio.

Choosing your right gearing is all about compromise. A low ratio is a 373 and a high ratio is a 273 I know it seems contrary to what sounds correct but thats how it is. A lower taller gear ratio provides a higher top speed and a higher shorter gear ratio provides faster acceleration.

Most automobiles use gear ratios in the drive axle and the transmission to multiply power. If you plan on towing a fifth-wheel trailer or anything heavier than 5000 pounds you should consider a 41 axle ratio. Rear end ratios are stamped into the rear drive.

For those curious my search to find a rear end gear or final drive gear change has come to an end Ive found a source to re gear the th425 for all toronados it comes with a new pumpkin box and gears and a new 10 bolt main gaskets and covers included and offer to dial in your speedometer in the price its a. When you hear car drivers refer to numbers such as 3081 3731 or even 4101 they discuss the ring-and-pinion gears ratio within the rear axle. Final Drive Ratio.

The final drive ratio is what you end up with when you factor in the transmission and transfer case gearing and the axle gear ratio. Its the combination of trans gearing and FDR that effects acceleration not the FDR alone. What does changing it doCar Gears - httpsyoutubebgGgH0j0KQESubscribe for new videos every Wednesday.

If you increase the final drive ratio each gear will have greater wheel torque while sacrificing top speed. When you multiply the two ratios it equals the final drive ratio. Besides the gears in the transmission there is also a gear in the rear differential.

This is known as the final drive differential gear Crown Wheel Pinion CWP or ring and pinion. When we talk about gearing were referring to the final-drive ratio which you get by dividing the number of teeth on the rear sprocket by the. Two common base axle ratios for trucks are 308 and 342.

The driving torque developed by the engine and transmission needs to be delivered in a smooth and effective manner to the drive wheels and it is the job of. You could then use this value to determine the total amount of output torque. Changing the final drive ratio heavily impacts the way the car behaves.

You need to have a helper very accurately measure the radius of the tire with you and normal load bike balanced on its tires as previously noted. A 41 ratio allows a towing vehicle to start moving without as much throttle. A 373 ratio is suitable for regular light towing.

Re gearing the final drive. Even though the Vette may only be a 273 the gearing in the transmission compensates for that. The driveshaft speed is affected by the transmission output ratio.

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